The AP reports,

Orthodox Jews in New York have become concerned that the city’s drinking water may not be kosher because it contains tiny crustaceans known as copepods.
The organisms, which measure about a millimeter long, pose no threat to human health, according to the city Department of Environmental Protection. But Orthodox teaching bars the eating of crustaceans — aquatic animals with skeletons outside their bodies, including shrimp, crab and lobsters.

Is this another instance of paranoid wig-burning or is there really a great concern here? The kosher fish we eat swim in the same oceans as the trayfe ones… Thus the water is technically still kosher. Don’t the water filtration systems sift all this stuff our before it reaches your tap anyway?